EP3249294B1 - Düsenspitze eines kohlenstaubbrenners - Google Patents

Düsenspitze eines kohlenstaubbrenners Download PDF

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Publication number
EP3249294B1
EP3249294B1 EP16204468.9A EP16204468A EP3249294B1 EP 3249294 B1 EP3249294 B1 EP 3249294B1 EP 16204468 A EP16204468 A EP 16204468A EP 3249294 B1 EP3249294 B1 EP 3249294B1
Authority
EP
European Patent Office
Prior art keywords
nozzle tip
tubular body
pulverized coal
inner tubular
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16204468.9A
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English (en)
French (fr)
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EP3249294A1 (de
Inventor
Kyoung Taek Oh
Byoung Hwa Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Doosan Heavy Industries and Construction Co Ltd
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Doosan Heavy Industries and Construction Co Ltd
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Publication of EP3249294A1 publication Critical patent/EP3249294A1/de
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Publication of EP3249294B1 publication Critical patent/EP3249294B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10—Nozzle tips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20—Fuel flow guiding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/30—Wear protection

Definitions

  • Exemplary embodiments of the present invention relate to a nozzle tip for a pulverized coal burner, and more particularly, to a nozzle tip of a pulverized coal burner, which is capable of preventing the abrasion and separation of flame stabilizers due to the flow of pulverized coal.
  • the nozzle tip of a coal burner is generally disposed at a corner within a combustion chamber.
  • the direction of the nozzle tip of the coal burner may vary when the boiler is operated.
  • the flame temperature in the combustion chamber may be regulated by changing the direction of the nozzle tip in the upward and downward directions
  • the supply direction of coal as fuel may vary by changing the nozzle tip in the clockwise or counterclockwise direction of flame in the state in which the nozzle tip is away from the center of the combustion chamber.
  • Fig. 1 is a perspective view illustrating the state in which a conventional nozzle tip is installed at the end of a fuel pipe.
  • Fig. 2 is a perspective view for explaining the configuration of the conventional nozzle tip.
  • Fig. 3 is a cross-sectional view of Fig. 2 .
  • a nozzle tip 20 is installed at the end of a fuel pipe 10, and the nozzle tip 20 has driver holes 14 and 16 formed at one side thereof so that an actuator is connected to the driver holes 14 and 16.
  • the nozzle tip may vertically move about a bent shaft 12 by the operation of the actuator.
  • the nozzle tip may consist of a plurality of nozzle tips arranged in the combustion chamber in a coal burner. Only some of the nozzle tips are employed and the remaining nozzle tips may be used as spare parts.
  • the nozzle tip 20 Since the nozzle tip 20 is directly exposed to the combustion chamber, the nozzle tip 20 has a dual wall for an improvement in durability. Coal is supplied to the internal space of the nozzle tip, and a portion of air for combustion is supplied outside the internal space (to the space between the inside and the outside).
  • an outer tubular body 40 is disposed outside an inner tubular body 30, guide blades 50 are disposed inside the inner tubular body 30, and share bars 60 are disposed at the sides of the inner surface of the inner tubular body 30.
  • a gap member is disposed between the inner tubular body 30 and the outer tubular body 40 to define a space portion.
  • one side of the inner tubular body 30 is connected to the end of the fuel pipe 10 by the bent shaft 12, with the consequence that the nozzle tip is assembled to the fuel pipe so as to bend the direction of the nozzle tip.
  • the inner and outer tubular bodies 30 and 40 form a square tubular body by welding the corners of four inner and outer panels.
  • the share bars 60 serve to pull flame toward the nozzle tip 20 by swirling air and pulverized coal.
  • the share bars 60 are constituted as a single body and each has an elongated rectangular shape.
  • one surface of the share bar 60 is fixed to the inner surface 32 of the inner tubular body 30 by welding (W), and particularly the respective share bars 60 are fixedly coupled to the front ends of the upper and lower sides of the inner tubular body 30.
  • each of the share bars 60 may be partially or entirely worn due to the collision with pulverized coal flowing by the guide blades 50.
  • the welded portions of the share bars 60 may be cracked due to the radiant heat, resulting in the separation of the share bars from the nozzle tip.
  • WO 94/05952 A1 describes a fossil fuel/air burner nozzle which is provided with a wall at its inlet, in which are apertures which narrow in a direction radially outward of the nozzle.
  • WO 2010/081271 A1 describes a rapidly-ignited pulverized coal nozzle which includes a nozzle outer shell, a nozzle inner shell provided inside the nozzle outer shell, connecting angle plates provided in the corners of the nozzle outer shell and the nozzle inner shell, at least one flame stabilization tooth provided on the upper side and the lower side of the nozzle inner shell respectively, and at least one splitter plate provided in the middle of the nozzle inner shell.
  • An object of the present invention is to provide a nozzle tip of a pulverized coal burner, which is capable of preventing the abrasion and separation of flame stabilizers due to the flow of pulverized coal.
  • a nozzle tip for a pulverized coal burner which includes an inner tubular body having a first passage in which pulverized coal introduced into the inner tubular body flows, an outer tubular body installed outside the inner tubular body while being spaced apart therefrom, and at least one guide plate installed to partition the first passage, includes a plurality of flame stabilizers arranged in a row at the and/or lower sides in the inner tubular body, wherein each of the flame stabilizers has an inclined surface formed on a side thereof facing a direction in which the pulverized coal flows in the first passage, the inclined surface being inclined toward a central portion of the inner tubular body.
  • the inclined surface has a quadrant shape that is concave toward the central portion of the inner tubular body.
  • the flame stabilizers may be arranged at the front side of the nozzle tip.
  • the flame stabilizers may be arranged being spaced apart from each other with a predetermined distance to the adjacent flame stabilizer on the upper and/or lower side of the inner tubular body.
  • the distance is smaller than the width of the flame stabilizers.
  • the flame stabilizers may be arranged in a row at each of the upper and the lower side in the inner tubular body.
  • nozzle tip according to exemplary embodiments of the present invention is described below as being used in the furnace of the coal-fired thermal power plant, the present invention is not limited thereto.
  • the nozzle tip may be applied to all types of burners to which pulverized coal as a fuel is supplied.
  • Each of the inner and outer tubular bodies 100 and 200 may have any tubular shape so as to serve as a passage for the flow of fluid.
  • the inner tubular body 100 forms a square tubular body by welding a plurality of inner panels
  • the outer tubular body 200 forms a square tubular body by welding a plurality of outer panels.
  • the inner tubular body 100 has a first passage 120 which is formed in forward and rearward directions therein so that pulverized coal is introduced into and flows in the first passage 120.
  • the pulverized coal and air introduced rearward through the first passage 120 are discharged forward, and flame is formed close to the front of the first passage 120.
  • air may be supplied by the outer tubular body 200 in a flame direction in a second passage 220 which is formed between the outer and inner tubular bodies.
  • a cover tubular body may be coupled to the fuel pipe at the rear of the outer tubular body 200 so as to cover a portion of the fuel pipe.
  • the guide plate 300 may be horizontally installed inside the inner tubular body 100, in order to guide the introduction direction of pulverized coal and partition the first passage 120.
  • the flame stabilizers 400 are arranged in a row at each of upper and lower sides in the inner tubular body 100.
  • the flame stabilizers 400 may be installed at the front ends of the inner tubular body 100, to which pulverized coal is discharged through the first passage 120, in order to actively mix fuel and oxidizer and perform advanced ignition.
  • the flame stabilizers 400 serve to pull flame toward the nozzle tip by swirling air and pulverized coal.
  • the number of flame stabilizers may vary according to the size of the nozzle tip, and is preferably two to six. Seven or more flame stabilizers may be provided. However, if the number of flame stabilizers is more than enough, it may take a lot of time and labor to manufacture the nozzle tip. Therefore, it is preferable to provide an adequate number of flame stabilizers.
  • the flame stabilizers 400 may be fixed to the inner surface of the inner tubular body 100 by welding or by separate members such as bolts.
  • the inner tubular body is formed with holes for the installation of the flame stabilizers, and the flame stabilizers are formed with holes at positions corresponding to the holes of the inner tubular body. Subsequently, after pins are simultaneously inserted into the holes of the inner tubular body and the holes of the flame stabilizers, the flame stabilizers may be coupled to the inner tubular body by welding the flame stabilizers to the inner tubular body and welding the pins to the outside of the inner tubular body.
  • each of the flame stabilizers 400 is preferably made of a material having high durability to abrasion and damage, and may be made of a high-hardness material such as ceramic or cemented carbide.
  • the ceramic may include, for example, silicon carbide, alumina, and a mixture of alumina and zirconia, and the cemented carbide may include, for example, tungsten carbide (WC).
  • WC tungsten carbide
  • the pulverized coal mixed with air flows at a high speed in the first passage 120 of the inner tubular body, and thus pulverized coal particles collide with the flame stabilizers 400.
  • the inclined surface 420 is formed on the rear side of the flame stabilizer 400.
  • the inclined surface 420 is formed on the side of the flame stabilizer 400, which collides with pulverized coal, the pulverized coal collides obliquely instead of vertically with the rear side of the flame stabilizer 400. Consequently, the momentum of pulverized coal particles may be dispersed and the wear resistance of the flame stabilizer may be enhanced.
  • Fig. 10 is a view illustrating the flow temperature distribution in the conventional nozzle tip.
  • Fig. 11 is a view illustrating the flow temperature distribution in the nozzle tip of a pulverized coal burner.
  • the temperature around the side of the flame stabilizer facing the flow direction of pulverized coal is very high due to collision since the rear side of the flame stabilizer is vertically formed.
  • the temperature of the rear side of the flame stabilizer is not high.
  • the conventional nozzle tip is exposed to high-temperature environment for a long time, various ingredients of pulverized coal flowing in the first passage are affected by high temperature. For this reason, the pulverized coal may be attached to the inner surface of the inner tubular body or the flame stabilizer, and hence a slagging phenomenon may occur.
  • the inclined surface 420 is a flat surface. Specifically, the front side of the flame stabilizer 400 forms an angle of 90° with the inner surface of the inner tubular body 100, and the inclined surface 420 is inclined such that the width of the flame stabilizer is narrowed toward the central portion of the inner tubular body 100 from the inner surface thereof in the cross-section of the nozzle tip.
  • the inclined surface 420 preferably forms an angle of 30 to 50° with the inner surface of the inner tubular body 100.
  • the angle is less than 30°, the inclined surface is elongated.
  • the momentum of pulverized coal particles may not be effectively dispersed in the event that the inclined surface collides with pulverized coal flowing in the first passage 120.
  • the flame stabilizer 400 has a wide area compared to the conventional flame stabilizer having a rectangular plate shape and is fixed to the inner surface of the inner tubular body 100, it is possible to prevent the separation of the flame stabilizer due to abrasion.
  • each of flame stabilizers includes a flame stabilizer fixing portion 4400 which is fixed into an inner tubular body and a wear-resistant member 4500 which is detachably coupled to the side of the flame stabilizer fixing portion 4400, facing the direction in which pulverized coal flows in a first passage 120, similar to FIG. 8 .
  • the wear-resistant member 4500 may have an inclined surface 4520 formed such that the first passage 120 is narrowed in the direction in which pulverized coal flows in the first passage 120.
  • the flame stabilizer fixing portion 4400 may have a rectangular shape, and the wear-resistant member 4500 may have the inclined surface 4520 which is curved at the side of the flame stabilizer fixing portion 4400 facing the flow direction of pulverized coal.
  • the curved surface has a quadrant shape that is concave toward the central portion of the inner tubular body 100.
  • the wear-resistant member 4500 may be coupled to the flame stabilizer fixing portion 4400 by welding or bolting.
  • the wear-resistant member 4500 may be coupled to the flame stabilizer fixing portion 4400 in such a manner that the protrusion of the wear-resistant member 4500 is fitted into the groove of the flame stabilizer fixing portion 4400.
  • an inclined surface is formed on the side of each of flame stabilizers or the wear-resistant member thereof, facing the direction in which pulverized coal flows in a first passage in the nozzle tip. Accordingly, the pulverized coal collides obliquely instead of vertically with the flame stabilizer or wear-resistant member, thereby enabling the momentum of pulverized coal particles to be dispersed and enabling the wear resistance of the flame stabilizer or the wear-resistant member to be enhanced.
  • the flame stabilizer has a wide area compared to a conventional flame stabilizer having a rectangular plate shape and is fixed to the inner surface of an inner tubular body, it is possible to prevent the separation of the flame stabilizer due to abrasion.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Claims (11)

  1. Düsenspitze für einen Kohlenstaubbrenner, die einen inneren rohrförmigen Körper (100), der einen ersten Durchlass (120) aufweist, in dem Kohlenstaub, der in den inneren rohrförmigen Körper (100) eingeführt wird, strömt, einen äußeren rohrförmigen Körper (200), der außerhalb des inneren rohrförmigen Körpers (100) eingerichtet ist, während er von diesem beabstandet ist, und mindestens eine Führungsplatte (300), die eingerichtet ist, um den ersten Durchlass (120) zu unterteilen, umfasst, wobei die Düsenspitze umfasst:
    mehrere Flammenstabilisatoren (400), die an der oberen und/oder unteren Seite in dem inneren rohrförmigen Körper (100) in einer Reihe angeordnet sind,
    wobei jeder der Flammenstabilisatoren (400) eine geneigte Fläche (1420) aufweist, die an einer Seite davon ausgebildet ist, die einer Richtung zugewandt ist, in der der Kohlenstaub im ersten Durchlass (120) strömt, wobei die geneigte Fläche (1420) zu einem Mittelabschnitt des inneren rohrförmigen Körpers (100) hin geneigt ist,
    dadurch gekennzeichnet, dass die geneigte Fläche (1420, 4520) eine Viertelkreisform aufweist, die zum Mittelabschnitt des inneren rohrförmigen Körpers (100) hin konkav ist.
  2. Düsenspitze nach Anspruch 1, wobei die Flammenstabilisatoren (400) an der Vorderseite der Düsenspitze angeordnet sind.
  3. Düsenspitze nach Anspruch 1 oder 2, wobei die Flammenstabilisatoren (400) voneinander beabstandet mit einem vorbestimmten Abstand zu dem benachbarten Flammenstabilisator (400) an der oberen oder unteren Seite des inneren rohrförmigen Körpers (100) angeordnet sind.
  4. Düsenspitze nach einem der vorhergehenden Ansprüche, wobei die Flammenstabilisatoren (400) an jeder der oberen und der unteren Seite in dem inneren rohrförmigen Körper (100) in einer Reihe angeordnet sind.
  5. Düsenspitze nach einem der vorhergehenden Ansprüche, wobei die geneigte Fläche (1420) derart ausgebildet ist, dass der erste Durchlass (120) in der Strömungsrichtung des Kohlenstaubs verengt ist.
  6. Düsenspitze nach einem der vorhergehenden Ansprüche, wobei jeder der Flammenstabilisatoren (400) umfasst:
    einen Flammenstabilisator-Befestigungsabschnitt (4400), der in dem inneren rohrförmigen Körper (100) befestigt ist; und
    ein verschleißfestes Element (4500), das lösbar mit einer Seite des Flammenstabilisator-Befestigungsabschnitts (4400) verbunden ist, wobei es der Richtung zugewandt ist, in der der Kohlenstaub in dem ersten Durchlass (120) strömt.
  7. Düsenspitze nach Anspruch 6, wobei die geneigte Fläche (4520) des verschleißfesten Elements (4500) derart ausgebildet ist, dass der erste Durchlass (120) in der Richtung, in der der Kohlenstaub in dem ersten Durchlass (120) strömt, verengt ist.
  8. Düsenspitze nach einem der vorhergehenden Ansprüche, wobei der äußere rohrförmige Körper (200) mit dem inneren rohrförmigen Körper (100) einen zweiten Durchlass (220) ausbildet.
  9. Düsenspitze nach Anspruch 8, wobei der zweite Durchlass (220) von der Vorderseite des ersten Durchlasses (120) an der Vorderseite der Düsenspitze weg gerichtet ist.
  10. Düsenspitze nach einem der vorhergehenden Ansprüche, wobei die Führungsplatte (300) horizontal innerhalb des inneren rohrförmigen Körpers (100) eingerichtet ist.
  11. Verwendung einer Düsenspitze nach einem der vorhergehenden Ansprüche in einem Kohlekraftwerk.
EP16204468.9A 2016-05-24 2016-12-15 Düsenspitze eines kohlenstaubbrenners Active EP3249294B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160063430A KR101773297B1 (ko) 2016-05-24 2016-05-24 미분탄 버너의 노즐 팁

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EP3249294A1 EP3249294A1 (de) 2017-11-29
EP3249294B1 true EP3249294B1 (de) 2019-08-14

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EP (1) EP3249294B1 (de)
KR (1) KR101773297B1 (de)
CN (1) CN107420889A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6926009B2 (ja) * 2018-02-01 2021-08-25 三菱パワー株式会社 燃焼バーナ及びボイラ
KR102080564B1 (ko) * 2018-10-02 2020-02-24 두산중공업 주식회사 미분탄 버너의 노즐 팁
JP7086831B2 (ja) * 2018-12-26 2022-06-20 三菱重工業株式会社 燃焼バーナ、ボイラ及び燃焼バーナの組立方法
US20230038688A1 (en) * 2021-08-03 2023-02-09 General Electric Technology Gmbh Pulverized solid fuel nozzle tip assembly with carbon tip portion

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Also Published As

Publication number Publication date
KR101773297B1 (ko) 2017-08-30
CN107420889A (zh) 2017-12-01
EP3249294A1 (de) 2017-11-29

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